Improvement in the manufacture of graduated glass measures



NITED STATES PATENT ()FFICE.

WILLIAM HoDcsor 'JR, or PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN THE MANUFACTURE OF GRADUATED GLASS MEASURES- Spe'cification forming part of Letters Patent No. 34,424, dated February 18, 1862.

To all whom it may concern:

Be it known that I, WILLIAM HODGSON, J r., of Philadelphia, Pennsylvania, have invented a new and Improved Mode of Manufacturing Graduated Glass Measures, and Ido hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention consists in making glass measures in a :press-mold, so constructed, marked, and shapedv that all vessels made therein will be precisely alike as regards form and capacity, and will have graduations so arranged in respect to that form and capacity that the same accurate measurement may be made by all the vessels alike, thereby avoiding the usual'tedious, expensive, and at the same time uncertain operation of testing each yes-- sel separately and marking each in accordance with the test.

In order to enable others skilled in the art to practice my invention, I will now proceed to describe the manner in which :I carry it into eitect. 7

On reference to the accompanying drawings, which form a part of this specification, Figure 1 is a View of an opened mold, by the aid of which I practice my improved mode of manufacturing glass vessels; Fig. 2, a plan view of Fig. .1; Fig. 3, also a plan view showing the mold as closed.

Similar letters refer to similar parts throughout the several views.

The mold is composed of two halves A and A, the former having projections a a, between which similar projections 17 b on the half A of the mold fit snugly, as seen in Fig. 1, a pin G, passing through the projections, thereby hinging the halves together, and the lower end of the said pin being secured to the baseplate B. The half A of the mold has projections (1- d, between which fits a projection e on the half A, a detachable pin 0 passing through the whole of these projections when the mold is closed. In each half of the mold is formed a depression of sucha shape that when the two halves are brought together and connected to each other by the pin 0 they will incl'ose space of a form corresponding to that of the exterior of theglass measure, (which,

- in the present instance, is similar to those a nular projection f, which, fitting snugly tov an annular recess in the top of both halves ofthe mold, serves to maintain the. circular opening of the plate concentric with the space inclosed by the two halves of the mold. In this opening of the plate D fits the plug E,

the lower portion of whichis cone-shaped to correspond with the conical interior of the glass measure, the plug having a collar h, which, resting on the top of the plate D, provents the conical portion of the plug from descending beyond a given point into the interior of the mold, which point is indicated in the exterior of the mold byacertain mark m, which I term the apex-mark.

In the inside of the mold iscut a series of lines and figures H H to correspond with the desired graduations and marks on the glass 1neasure,'the position of these lines and fig- 11 res from each other and from the apex-mark being determined by carefully testing a glass measure made in the mold prior to the cutting of the graduations therein, and cutting the marks of the mold in accordance with those ascertained by the test for the respective graduations.

In forming the glass measure the two halves of the mold are first brought together and secured by the pin 0, the plate D being subsequently placed on the top of both halves. After this a given quantity of. molten glass is poured into the interior of the mold and the conical end of the plug E is forced through the opening of the plate D into the molten glass, thereby compressing the latter against the inside of the mold and into the graduated cuts until the collar h bears on the plate D- and the apex of the plug comes to a point exactly coinciding with the apex-mark m, when the desiredshape will be imparted to-both the interior and exterior of the glass, the ex: terior having the projecting marks, figures,

and letters[corresponding with those out in the mold, ,all' the glasses pressed in the mold will be preciselyalike, both as regards their form-aud the position of the graduated marks;

and all will be in the same respect like the original measure which first served as a guide for marking the mold, and the accuracy 01 any one of the glasses may be known by comparing the apexin the interior with the apexmark m of the exterior.

Graduated glass measures have hitherto been manufactured by first forming, by blowing or otherwise; a blank vessel, and subsefluid into the glass, the surfaces of the difierent quantities pointing out the position of the required marks-an operation not only.tedi- -ous, but liable through carlessness --to cause inaccuracies.

It will be evident that by my process, as described above, the delay and expense incurred in cutting the marks on the glass are avoided, asthe marks are made simultaneously with the formation of the vessel itself. It will also be evident that if the marks in the mold are in the first instance properly graduated from a test-measure and the operation of molding, as described above, properly conducted, particularly in regard to the depression of the plug to the given point, every measure made in the mold will be accurate.

It will be observed on reference to Fig. 1 that the upper portion of the interior of the mold, as well as a portion of the plug E, has parallel sides, the upper edge of the glass measure having, consequently, similar parallel sides. After removing the glass from the mold this parallel upper portion is cutaway, and the usual lip from which the liquid contents are poured is formed on the edge. The object of this apparently superfluous upper edge of the glass is to allow more of the molten material to be poured into the mold than is absolutely required for forming the measure and allowing the superfluous quantity to flow upward, thereby insuring the required compression of the glass and a sound and even upper edge.

Without confining myself to any particular form of mold, 1' claim as my invention and desire to secure by Letters Patent?- j The forming of graduated glass measures and the graduations thereon at one operationin a press-mold, so constructed, marked, and shaped that all vessels made in the same mold will be precisely alike as regards form and capacity, and will have graduations so arranged in respect-to that form and capacity that the same accurate measurementmay be made by all vessels alike, as herein set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

V. I-IODGSON, JR.

Witnesses:

HENRY HOWSON, L. J. LANCASlER. 

